patch 8.2.3396: when libcall() fails invalid pointer may be used Commit: https://github.com/vim/vim/commit/87e1587b8add93e40340170e4261cdadc4c8940e Author: Bram Moolenaar <Bram@vim.org> Date: Thu Sep 2 19:53:07 2021 +0200 patch 8.2.3396: when libcall() fails invalid pointer may be used Problem: When libcall() fails invalid pointer may be used. Solution: Initialize the string to NULL. (Yasuhiro Matsumoto, closes https://github.com/vim/vim/issues/8829)